使用SpringBoot 配置Oracle和H2双数据源及问题

网友投稿 650 2022-09-14


使用SpringBoot 配置Oracle和H2双数据源及问题

目录配置POM配置yml配置注入问题

在上节使用了H2之后感觉很爽,很轻便,正好有个项目要求简单,最好不适用外部数据库,于是就想着把H2数据库集成进来,这个系统已经存在了一个Oracle,正好练习下配置多数据源,而在配置多数据源时,H2的schema配置不生效真是花了我好长时间才解决。。。所以也记录一下

配置POM

com.github.noraui

noraui

2.4.0

com.h2database

h2

1.4.197

com.baomidou

mybatis-plus-boot-starter

3.1.1

配置yml

spring:

http:

encoding:

charset: UTF-8

enabled: true

force: true

datasource:

driver-class-name: org.h2.Driver

schema: classpath:h2/schema-h2.sql

data: classpath:h2/data-h2.sql

jdbc-url: jdbc:h2:file:D:/Cache/IdeaWorkSpace/BigData/CustomerModel/src/main/resources/h2/data/h2_data

username: root

password: a123456

initialization-mode: always

oracle:

driver-class-name: oracle.jdbc.driver.OracleDriver

jdbc-url: jdbc:oracle:thin:@xxx:1521:cmis

username: xxx

password: xxx

h2:

console:

enabled: true

path: /h2-console

可以看到配置中配置了两个数据源,主数据源是H2,第二个数据源是Oracle,接下来是通过配置类来注入数据源

配置注入

配置H2主数据源

package com.caxs.warn.config;

import org.apache.ibatis.session.SqlSessionFactory;

import org.mybatis.spring.SqlSessionFactoryBean;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.boot.jdbc.DataSourceBuilder;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**

* @Author: TheBigBlue

* @Description:

* @Date: 2019/9/18

*/

@Configuration

@MapperScan(basePackages = "com.caxs.warn.mapper.h2", sqlSessionFactoryRef = "h2SqlSessionFactory")

public class H2DSConfig {

@Bean(name = "h2DataSource")

@ConfigurationProperties(prefix = "spring.datasource")

public DataSource dataSource() {

return DataSourceBuilder.create().build();

}

@Bean(name = "h2TransactionManager")

public DataSourceTransactionManager transactionManager() {

return new DataSourceTransactionManager(this.dataSource());

}

@Bean(name = "h2SqlSessionFactory")

public SqlSessionFactory sqlSessionFactory(@Qualifier("h2DataSource") DataSource dataSource) throws Exception {

final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

sessionFactory.setDataSource(dataSource);

sessionFactory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);

return sessionFactory.getObject();

}

@Bean(name = "h2Template")

public JdbcTemplate h2Template(@Qualifier("h2DataSource") DataSource dataSource) {

return new JdbcTemplate(dataSource);

}

}

配置oracle从数据源

package com.caxs.warn.config;

import org.apache.ibatis.session.SqlSessionFactory;

import org.mybatis.spring.SqlSessionFactoryBean;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.boot.jdbc.DataSourceBuilder;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**

* @Author: TheBigBlue

* @Description:

* @Date: 2019/9/18

*/

@Configuration

@MapperScan(basePackages = "com.caxs.warn.mapper.oracle",sqlSessionFactoryRef = "oracleSqlSessionFactory")

public class OracleDSConfig {

@Bean(name = "oracleDataSource")

@ConfigurationProperties(prefix http://= "spring.datasource.oracle")

public DataSource dataSource() {

return DataSourceBuilder.create().build();

}

@Bean(name = "oracleTransactionManager")

public DataSourceTransactionManager transactionManager() {

return new DataSourceTransactionManager(this.dataSource());

}

@Bean(name = "oracleSqlSessionFactory")

public SqlSessionFactory sqlSessionFactory(@Qualifier("oracleDataSource") DataSource dataSource) throws Exception {

final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

sessionFactory.setDataSource(dataSource);

sessionFactory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);

return sessionFactory.getObject();

}

@Bean(name = "oracleTemplate")

public JdbcTemplate oracleTemplate(@Qualifier("oracleDataSource") DataSource dataSource) {

return new JdbcTemplate(dataSource);

}

}

问题

Schema “classpath:h2/schema-h2.sql” not found

经过上面的配置就可以使用双数据源了,但是当我们测试时会发现报如下错误:Schema “classpath:h2/schema-h2.sql” not found,这个问题我也是找了好久,因为在配置但数据源的时候没有这个问题的,在配置多数据源才有了这个问题。

单数据源时,是直接SpringBoot自动配置DataSource的,这个时候是正常的,而当配置多数据源时,我们是通过@Configuration来配置数据源的,怀疑问题出在 DataSourceBuilder 创建数据源这个类上,而单数据源自动装载时不会出现这样的问题。然后百度搜了下这个DataSourceBuilder,看到文章中实例的配置中schema是这样写的:

package com.caxs.warn.service;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.ApplicationArguments;

import org.springframework.boot.ApplicationRunner;

import org.springframework.core.io.ClassPathResource;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.stereotype.Component;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

/**

* @Author: TheBigBlue

* @Description: 服务启动后,初始化数据库

* @Date: 2019/9/19

*/

@Component

public class ApplicationRunnerService implements ApplicationRunner {

private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationRunnerService.class);

@Autowired

@Qualifier("h2Template")

private JdbcTemplate h2Template;

@Value("${invoke.schema.location}")

private String schema;

@Value("${invoke.data.location}")

private String data;

/**

* @Author: TheBigBlue

* @Description: 项目启动,执行sql文件初始化

* @Date: 2019/9/19

* @Param args:

* @Return:

**/

@Override

public void run(ApplicationArguments args) {

String schemaContent = this.getFileContent(schema);

String dataContent = this.getFileContent(data);

h2Template.execute(schemaContent);

h2Template.execute(dataContent);

}

/**

* @Author: TheBigBlue

* @Description: 获取classpath下sql文件内容

* @Date: 2019/9/19

* @Param filePath:

* @Return:

**/

private String getFileContent(String filePath) {

BufferedReader bufferedReader = null;

String string;

StringBuilder data = new SRYqANltringBuilder();

try {

ClassPathResource classPathResource = new ClassPathResource(filePath);

bufferedReader = new BufferedReader(new InputStreamReader(classPathResource.getInputStream()));

while ((string = bufferedReader.readLine()) != null) {

data.append(string);

}

} catch (IOException e) {

LOGGER.error("加载ClassPath资源失败", e);

}finally {

if(null != bufferedReader){

try {

bufferedReader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return data.toString();

}

}

抱着尝试的态度改了下,发现果然没问题了!!原来是在SpringBoot2.0之后schema对应的DataSourceProperties类中schema属性是一个List,所以需要前面加 - (yml中加-映射集合),记录下防止后面再踩坑。

Table “USER” not found; SQL statement:

这个问题也是在只有配置多数据源时才会碰到的问题,就是配置的spring.datasource.schema和spring.datasource.data无效。这个我看了下如果是配置单数据源,springboot自动加载Datasource,是没问题的,但是现在是我们自己维护的datasource: return DataSourceBuilder.create().build();所以感觉还是DataSourceBuilder在加载数据源的时候的问题,但是还是没有找到原因。有网友说必须加initialization-mode: ALWAYS这个配置,但是我配置后也是不能用的。

最后没办法就配置了一个类,在springboot启动后,自己加载文件,读取其中的sql内容,然后用jdbcTemplate去执行了下,模拟了下初始化的操作。。。后面如果有时间再来解决这个问题。

package com.caxs.warn.service;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.ApplicationArguments;

import org.springframework.boot.ApplicationRunner;

import org.springframework.core.io.ClassPathResource;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.stereotype.Component;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

/**

* @Author: TheBigBlue

* @Description: 服务启动后,初始化数据库

* @Date: 2019/9/19

*/

@Component

public class ApplicationRunnerService implements ApplicationRunner {

private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationRunnerService.class);

@Autowired

@Qualifier("h2Template")

private JdbcTemplate h2Template;

@Value("${invoke.schema.location}")

private String schema;

@Value("${invoke.data.location}")

private String data;

/**

* @Author: TheBigBlue

* @Description: 项目启动,执行sql文件初始化

* @Date: 2019/9/19

* @Param args:

* @Return:

**/

@Override

public void run(ApplicationArguments args) {

String schemaContent = this.getFileContent(schema);

String dataContent = this.getFileContent(data);

h2Template.execute(schemaContent);

h2Template.execute(dataContent);

}

/**

* @Author: TheBigBlue

* @Description: 获取classpath下sql文件内容

* @Date: 2019/9/19

* @Param filePath:

* @Return:

**/

private String getFileContent(String filePahttp://th) {

BufferedReader bufferedReader = null;

String string;

StringBuilder data = new StringBuilder();

try {

ClassPathResource classPathResource = new ClassPathResource(filePath);

bufferedReader = new BufferedReader(new InputStreamReader(classPathResource.getInputStream()));

while ((string = bufferedReader.readLine()) != null) {

data.append(string);

}

} catch (IOException e) {

LOGGER.error("加载ClassPath资源失败", e);

}finally {

if(null != bufferedReader){

try {

bufferedReader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return data.toString();

}

}


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